Blog owners do not always understand the reasons behind the mysterious blog security check (following "suspicious" / "unusual" activity account lock). We see periodic complaints about deleted blogs and locked accounts - and the inconvenience involved, in Blogger Help Forum: Get Help with an Issue . I get the security and all - but I don't get how a blog is just deleted. This blog owner, like so many, does not understand how Blogger is trying to keep our blogs under our control - even after detection of "suspicious" / "unusual" activity.
What Blogger won't tell you